Arc'teryx is Chinese owned and for quite some time already. There's probably only a few Canadian clothing brands that are worthwhile in Canada, but most of them don't manufacture in Canada either.
Either way, Lululemon comes to mind, but their founder Chip Wilson isn't a pleasant person in supporting certain political parties even though he technically has been booted by the board of the company (I'm sure he still has shares). Artizia, Psychobunny, Roots...just to name a few that could be considered. Of course, if you're looking for outdoor wear, I'd say look to the European brands and even then it's a minefield.
One of three named is Choice REIT and is owned by Galen Weston - why am I not surprised given the rep with Loblaws & Co? Looks like they're more than cozied up with DoFo.